:root { color-scheme: dark; --bg: #0E1116; --panel: #161B22; --line: #2A313C; --fg: #E8EDF3; --muted: #9AA6B2; --acc: #3D8BFD; --err: #FF7B72; }
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--fg);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
body { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 16px; }
.card { width: 100%; max-width: 360px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 24px; }
h1 { margin: 0; font-size: 1.4rem; }
.sub { margin: 2px 0 18px; color: var(--muted); font-size: .9rem; }
form { display: flex; flex-direction: column; gap: 8px; }
label { font-size: .9rem; color: var(--muted); }
input { font: inherit; padding: 11px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); width: 100%; }
input:focus { outline: 2px solid var(--acc); outline-offset: 1px; }
button { margin-top: 10px; font: inherit; font-weight: 600; padding: 12px; border: 0; border-radius: 8px; background: var(--acc); color: #fff; cursor: pointer; }
.err { color: var(--err); margin: 0 0 12px; }